There are kits to do this.
If you are going OEM.

And they replace the fuel lines completely.

You may want to consider a variable pattern injector and not a fixed pattern type.

They are used on performance diesel motors ... Like the Ford PowerStoke.

I am not sure if they sell them for the Mercedes, think so.

You will need to adjust the injector timing as well.
This is very important.

Diesels are sloppy when the injector timing is concerned.
Not like gas type injector systems.

Having it tuned, will give you the most noticable power gain overall ... even if you just use the old ones for that matter.

And you should replace them all.

What happens is the spring inside the injector gets worn, and eventually does not perform correctly.

Thanks